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Achieving large bandwidth at strong mode conversion strengths is a centralproblem in few-mode optical waveguides. The most uncomplicated modification ofa standard mode-converting grating is to incorporate a single extra gap. Suchsimple design has not been applied yet for broadening conversion spectrumbetween core modes of any few-mode waveguide e.g. few-mode fiber, possibly dueto lacking knowledge of critical parameter control: (a) phase shift value atresonance wavelength, and (b) deterministic method for placement of the phaseshift(s) accommodating the change in waveguide properties during gratingwriting. From semi-analytical considerations, we show in full generality thatour design of a single-phase-shifted grating increases the bandwidth at 99 %conversion strength by more than 2.9 times, together with elucidating crucialparameter tolerances. The phase-shift placement is determinable on-the-go fromthe conversion spectra, thereby obviating any estimation of modified waveguideproperties during grating-writing. This offers the longed on-demand in-fibersolution for dispersion control in fiber laser cavities and communicationsystems.

Tripling the 99 % mode conversion bandwidth of gratings using a single phase shift